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What do we mean when we talk about the Milky Way in our sky?A. The bright stars of the constellations that lie along the ecliptic in our sky.B. The spiral-shaped galaxy in which we live.C. The patchy band of light that outlines the plane of the Milky Way Galaxy as seen from Earth.D. The whitish patch of light we see when we look toward the center of the Milky Way Galaxy.

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In which of the following cases would you feel weightless?A. While falling from a roofB. While accelerating downward in an elevatorC. While walking on the MoonD. While parachuting from an airplane

What do we mean by the orbital energy of an orbiting object (such as a planet, moon, or satellite)?A. Orbital energy is a measure of the object's speed as it moves through its orbit.B. Orbital energy is the amount of energy required for the object to leave orbit and escape into space.C. Orbital energy is the sum of the object's kinetic energy and its gravitational potential energy as it moves through its orbit.D. Orbital energy is the object's kinetic energy as it moves through its orbit.

Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)A. Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month.B. Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.C. Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.D. Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.

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